Apply for the job you think you’re not ready for. Let them be the ones to say no.

Readiness is not a state you reach in advance, it is something most people assemble in the first two months of a role. The person doing the hiring knows this, because they did it too. Your own estimate of readiness is made with the least information in the room, since you cannot see who else applied.

Send it without editing yourself down in the cover note. Do not list what you lack, describe what you have done and what you learn quickly. The worst realistic outcome is a quiet inbox, which is where you already are.